Air nozzle



Jan. 27, v1942. F. H. CHIRGWIN AIR NOZZLE Filed April 3, 1940 INVENTOR Flacone/cn( H cHew/v w C7 GDM ATTORNEY Patented Jan. 27, 1942 carico saves Prem ottici:

AIR NOZZLE Frederick H. Chirgwin, Los Angeles, Calif., assignor to B. F. Sturtevant Company,y Boston.

Mass.

Application April 3, 1940, Serial No. 327,695

3 Claims.

ture in the air condenses upon their surfaces and drips down upon the floors. Such nozzles have been insulated by placing thick, conical shaped cork nozzles over them but the expense has been great.

This invention provides a simple, relatively inexpensive air nozzle which avoids the objection o prior nozzles. In one embodiment of the invention, a pattern of the nozzle is laid out upon an The ejector nozzles are usuallyl formed from galvanized sheet iron and the moisinsulating composition board of the type known y as heat insulating Wall board, a suitable one being formed from cellulose fibre such as bagasse. The pattern corresponds, of course, to a developed, unrolled nozzle. The board is cut into blanks corresponding to the pattern;A are slitted along spaced converging lines; are then rolledfin succession over one or more conical templates; wire is Wrapped around each, and then after rev moval from the template, each assembly is dipped into hot tar which not only lls the slits and covers the wire but adds a pleasing glossy appearance.

An object of the invention is of insulated aii` nozzles.

The invention will now be described with reference to the drawing, of which:

Fig. 1 is a plan View of an unrolled, slotted, nozzle blank formed from an insulating board;

Fig. 2 is an end view looking at the right hand end (facing the drawing) of Fig. 1;

Fig. 3 is a sectional View of one embodiment of a completed nozzle incorporating this invention, with section taken along the longitudinal center, and

Fig. 4 is a view showing a completed nozzle embodying this invention, connected to a supply duct.

The nozzle to be formed is a conical one, and the developed pattern is laid out upon a cellulose insulating board, following which the blank 5 conforming to the pattern and shown by Figs. l and 2, is cut out. The equally. spaced slits 6 are cut along lines converging to the apex of the cone which would be formed by extension of the lines,

to reduce the cost to a depth about three-fourths of the way through the board. The blank is then rolled up, Apreferably on a conical template having the correct proportions, and the wire 1, shown in section by Fig. 3, is wound spirally around its exterior. The template is then removed from the `nozzle and the collar 8 is then attached by the screws 9, in the inlet end of the nozzle. The assembly is then Fig. 4 illustrates how the nozzle is mounted to the supply duct Il by beading the end of the collar 8 at l2. y

The tar I forms a smooth, glossy covering for the nozzle causing it to appear a's well as prior more expensive nozzles, and at the same time lls the slits 6, covers the wires 1 and binds the assembly together. While tar has been foundy satisfactory, other thermoplastic materials may be used.

While one embodiment of the invention has been described for the purpose of illustration, it

' should be understood that the invention is not limited to the exact method and apparatus described as modifications thereof may be suggested l by those skilled in the art without departure from the essence of the invention.

What is claimed is:

l. The method of forming a conical air nozzle, which comprises forming a developed pattern of a conical nozzle, cutting a blank corresponding to the pattern vfrom an insulating board, cutting slits along spaced converging lines partially through the blank, rolling the blank to the shape of the nozzle, tying the nozzle to prevent unrolling, and then dipping the assembly into aA heated thermoplastic solution.

2. The method of `forming a conical air nozzle, which comprises forming a developed pattern of a conical nozzle, cutting a blank corresponding to the pattern from an insulating board, cutting slits along spaced converging lines partially through the blank, rolling the blank to the shape of the nozzle, wiring the nozzle to prevent unrolling, and then dipping the assembly into a heated thermoplastic solution.

3. The method of forming a conical air nozzle, which comprises forming a developed pattern of a conical nozzle, cutting a blank corresponding to the pattern from an insulating board, 'cutting slits along spaced converging lines partially through the blank, rolling the blank to the shape of the nozzle, wiring the nozzle to prevent unrolling, and then dipping the assembly into heated tar.

` FREDERICK H. CHIRGWIN.

dipped into melted tar which forms the coating 

